<?php
class DB {

	var $version = '';
	var $querynum = 0;
	var $link = null;

	function db($conn) {
		$halt = 1;
		$func = empty($conn['pconnect']) ? 'mysql_connect' : 'mysql_pconnect';
		$this->get_execution_time();
		if(!$this->connection = @$func($conn['hostname'], $conn['username'], $conn['password'], 1)) {
			$halt && $this->halt('Can not connect to MySQL server');
		} else {
			if($this->version() > '4.1') {
				$db_encoding = in_array(strtolower($conn['encoding']), array('gbk', 'big5', 'utf-8')) ? str_replace('-', '', $conn['encoding']) : $conn['encoding'];
				$db_characterset = $db_encoding ? 'character_set_connection='.$db_encoding.', character_set_results='.$db_encoding.', character_set_client=binary' : '';
				$db_characterset .= $this->version() > '5.0.1' ? ((empty($db_characterset) ? '' : ',').'sql_mode=\'\'') : '';
				$db_characterset && mysql_query("SET $db_characterset", $this->connection);
			}
			$conn['database'] && @mysql_select_db($conn['database'], $this->connection);
		}

	}

	function select_db($database) {
		return mysql_select_db($database, $this->connection);
	}

	function fetch_array($query, $result_type = MYSQL_ASSOC) {
		return mysql_fetch_array($query, $result_type);
	}

	function fetch_first($sql) {
		return $this->fetch_array($this->query($sql));
	}

	function result_first($sql) {
		return $this->result($this->query($sql), 0);
	}

	function query($sql, $type = '') {

		global $APP, $AD;

		// debug progress

		$func = $type == 'UNBUFFERED' && @function_exists('mysql_unbuffered_query') ?
			'mysql_unbuffered_query' : 'mysql_query';
		if(!($query = $func($sql, $this->connection))) {
			if(in_array($this->errno(), array(2006, 2013)) && substr($type, 0, 5) != 'RETRY') {
				$this->close();
				$this->connect($APP['config']['dataconn']);
				return $this->query($sql, 'RETRY'.$type);
			} elseif($type != 'SILENT' && substr($type, 5) != 'SILENT') {
				$this->halt('MySQL Query Error', $sql);
			}
		}

		$this->querynum++;
		return $query;
	}

	function affected_rows() {
		return mysql_affected_rows($this->connection);
	}

	function error() {
		return (($this->connection) ? mysql_error($this->connection) : mysql_error());
	}

	function errno() {
		return intval(($this->connection) ? mysql_errno($this->connection) : mysql_errno());
	}

	function result($query, $row = 0) {
		$query = @mysql_result($query, $row);
		return $query;
	}

	function num_rows($query) {
		$query = mysql_num_rows($query);
		return $query;
	}

	function num_fields($query) {
		return mysql_num_fields($query);
	}

	function free_result($query) {
		return mysql_free_result($query);
	}

	function insert_id() {
		return ($id = mysql_insert_id($this->connection)) >= 0 ? $id : $this->result($this->query("SELECT last_insert_id()"), 0);
	}

	function fetch_row($query) {
		$query = mysql_fetch_row($query);
		return $query;
	}

	function fetch_fields($query) {
		return mysql_fetch_field($query);
	}

	function escape($value) {
		return mysql_real_escape_string($value, $this->connection);
	}

	function version() {
		if(empty($this->version)) {
			$this->version = mysql_get_server_info($this->connection);
		}
		return $this->version;
	}

	function close() {
		return mysql_close($this->connection);
	}

	function halt($message = '', $sql = '') {
		die($message." @ ".$sql);
	}

	function get_execution_time()
	{
		static $time_start;

		$time = strtok(microtime(), ' ') + strtok('');


		if(!$time_start)
		{
			$time_start = $time;
			return;
		}
		else
		{
			$total = $time-$time_start;
			$time_start = 0;
			if($total < 0) $total = 0;
			return $total;
		}
	}
}
?>